Though many years your junior, this sounds like something that would be no surprise if it were to happen to me. Certainly not as bad as a couple of years ago when I stubbed my toe in my own bedroom and broke it. At least you don't have far to fall.
That could have happened to anyone. Once. If it happens again, then there is something to worry about, because with your bionic toe, you could do some pretty serious damage to even an unusually sturdy bathtub.